package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;


    /**
     * 添加购物车中的一项
     * @param shoppingCartDTO
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        // 指定该用户车所属用户
        shoppingCart.setUserId(BaseContext.getCurrentId());
        // 查询该用户购物车中有无此菜品或者套餐
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        // 若有，数量加一，若无，插入
        if(shoppingCartList != null && shoppingCartList.size()>0){
            shoppingCart = shoppingCartList.get(0);
            //如果已经存在，就更新数量，数量加1
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }
        else {
            Long dishId = shoppingCartDTO.getDishId(); // 判断是dish还是setmeal

            if(dishId != null){ // 是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());;
            }
            else { // 是套餐
                //添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        Long userId = BaseContext.getCurrentId();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.listAll(userId);
        return shoppingCartList;
    }


    /**
     * 删除购物车中的菜品或套餐
     * @param shoppingCartDTO
     */
    @Override
    public void delDishOrSetmeal(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart =  ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .dishId(shoppingCartDTO.getDishId())
                .setmealId(shoppingCartDTO.getSetmealId())
                .build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        if(shoppingCartList != null && shoppingCartList.size()>0){
            shoppingCart = shoppingCartList.get(0);

            if(shoppingCart.getNumber() == 1){ // 如果就一份，则删掉
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }
            else {
                shoppingCart.setNumber(shoppingCart.getNumber()-1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }

        }

    }

    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.clean(userId);
    }
}
